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Key to Families 363<br />
KEY TO FAMILIES OCCURRING IN THE AREA<br />
Note: Families with an asterisk (*) are not known from Area 31 at present but are included in the key because<br />
they include wide-ranging deep-water or epipelagic species likely to be recorded in the area in the future.<br />
1a. No anal fin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2<br />
1b. Anal fin present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
2a. Body strongly depressed and ray-like; pectoral fins greatly enlarged, with anterior triangular<br />
lobes that overlap gill slits; mouth terminal (Fig. 1) . . . . . . . . . . . . . . . . Squatinidae<br />
2b. Body cylindrical, compressed, or slightly depressed, not ray-like; pectoral fins small, without<br />
anterior lobes; mouth ventral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3<br />
mouth<br />
terminal<br />
ventral view dorsal view<br />
Fig. 1 Squatinidae<br />
Fig. 2 Pristiophoridae<br />
3a. Snout greatly elongated into a flat saw with large, pointed denticles on sides and a pair of<br />
long, tape-like barbels on the lower surface (Fig. 2) . . . . . . . . . . . . . . . Pristiophoridae<br />
3b. Snout normal, not saw-like; no barbels on underside of snout . . . . . . . . . . . . . . . . 4<br />
4a. Trunk very high and compressed, triangular in section; dorsal fins very high; fin spine of<br />
first dorsal fin inclined forward (Fig. 3) . . . . . . . . . . . . . . . . . . . . . . . Oxynotidae<br />
4b. Trunk low and cylindrical, dorsal fins lower; fin spine of first dorsal fin, when present, inclined<br />
backward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5<br />
dorsal fins<br />
high<br />
pectoral-fin lobe<br />
saw-like snout<br />
barbels<br />
dermal denticles<br />
Fig. 3 Oxynotidae Fig. 4 Echinorhinidae<br />
5a Body set with sparse, large, plate-like denticles; spiracles small and well behind eyes; fifth<br />
pair of gill slits abruptly longer than others; first dorsal-fin origin over or posterior to pelvic-fin<br />
origins; pelvic fins much larger than second dorsal fin (Fig. 4) . . . . . . . . Echinorhinidae<br />
5b. Fifth gill slits not abruptly larger than first to fourth; spiracles larger and close behind eyes;<br />
first dorsal-fin origin well anterior to pelvic-fin origins; pelvic fins usually about as large as<br />
second dorsal fin or smaller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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